will it break the system files?

[cjzjm100]

Hi,all,i seted the encoding of vim in order to display chinese
well.Because when i opened source files programed by myslfe,the chinese
can't display well.My locale is zh_CN.UTF-8,here is the contents of .vimrc:
let &termencoding=&encoding
set fileencodings=utf-8,gbk,ucs-bom,cp936
After this ,will it break the system files when i edit the system files
by vim?